Relief-valve for locomotive-cylinders.



BEST Avmmma PATBNTED NOV. 15,1904

F. L. ROBINSON. RELIEF VALVE FOR LOGOMOTIVE CYLINDERS.

APPLIOATION FILED APB. 28. 1904.

- :66 MODEL.

WIT/$158858:

INVENTOB f 052325012 ATTORNEYS BEST AVAlL/XBLE w v UNITED I IiRE-DERI. Louis noinxso-x. o.

f ,R' Li 'F-VAL VE JFoR LobotnoTiv-e SPECIFICATI JON ibrming'part of Letters Patent No. 775,250, dated smiths 1:5 4,

Ail litatitnfii ii n28,1904. seminmeoazse. (romaine 1 To all whom concern- Beit known that I. FREDERIC' Louis Ron} 5 meme planner the UnitedjStal'cs. and a resident of Cheyenne; in the-county of, Lar: 1 mic and State of \Vyoniing, have invented a new and Improved Relief-Valve for Locomofive-Cylinders aiid the Like, of which the following is a full, clear. and exactdescription.

My invention relates to relief-valves, and more particularly to a type of such valve suitable for use upon locomotives to enable the engineer to vent cylinders at will and also to remove the water of condensation as fast as formed'while the engine is not in motion.

. Reference is to had to the accompanying drawings, forming apart'ot' this specification,

which similar characters of reference indicatecorresponding parts'inall the figures.

Y i j Figure-1 is a side elevation, partly insection, of a locomotive equipped with my. in-

vention. -Fig. 2. is an enlarged vertical section of the improved valve and its immediate connections. 'FigB-is' a front elevation of .thestrainer employed as a part of the valve Thelocoinotive-boiler shown at 5, the cab t 6, thefrnnningsboard at 7 the frame at 8,

. Ln'dthe wheels'atiQ, these parts being of the L usualfconstr'uction." f

The cylinder is shown at 10, the steam-chcst at 11,9 steam-tube at 12 for actuating my improved valve, and a hand-valve at 13 for controlling ItheinflQW of steam 1'rom the lboiler .to the stearn-tube. At the lower end cf the steamtube is a T 14, provided with pipes 15.

.LEach pipe 15 is fitted with a collar 16, which I [engages a washer 17. A casing 18 is provided with a threaded portion 19, encircled by an annular cap 20,this cap loosely fitting around the collar 16, so as to allow for expan sion and-contraction of the metals. I Withinthe casing- 18 is a spiral spring 21, engaging a steam-piston 22, provided with a stem 23,

rigidly connected thereto. The casing 18 is further provided With-a vent 24. Another casing, 25, is connected by a thread 26 with the casing 18am is provided with a chamber 27,

having avalve-seat 28, which is adapted to be closed by a valve 29, provided with a stem 40.

"llic strainer isshown at "closes against its seat 28, thereby compressing and is connected with a bend-38, securean t 31 and-5S -vided with holes 32'.arrangedf-infia around the-stem 40'. l -.:-1-;

A collar is fitted upon thecasing 255 means of athread' 34D andis provided witli. threaded neck 36, upon which is fitted-' ano'the collar, A tube-37' engages imeshare let for the cylinder 10.. v r f The tension of the spring 21 normally forces the piston 22 to the right as the parts are seen in Fig. The stem 23 presses the valve '29 to the right and away from its seat 28, so that any moisture may readily follow the course of the'arrow shown in Fig.2 and make 5 its escape through the vent 30. r 1f the engine is at a state of rcst, consc quently no steam is enteringor leaving the cylinders and the vent 30 is always open by virtue of the valve 29 being moved from its seat 28. This allows a free escape of the water of condensation. The instant that steam pressure is applied, however, the valve 29v the lower part of a tube 39, fornii'ng-iineutf the spring 21.- 'Each valve 29 therefore opens and closes each time the cylinder is alternately i relieved of pressure and subjected thereto.

If now the steam-pressure is on the cylinder, and consequently the valve 29 is closed, the engineer may open the same by merely turning steam' through the tube 12 to the T 14 by opening the hanchvalvedsifl'. The steam thus admitted presses directly againstthe piston 22, causing the stem 23 to force the valve 29 away from its seat, so as to allow apart of the steam under pressure of the cylinder to escape 'through the vent 30. The valve 29 is therefore automatic to the extent that it will always remove the water of condensation when the engine is idle, but is nevertheless under the direct control of the operator from his posi' tion in the cab. liloreover, the valve is operated with-great ease, because the piston 22 being of greater diameter than the valve 29 enables the valve to be opened quickly and with a powerful stroke by the mere application of the steam. It is necessary that the steam area of the steam-piston 22 be greater than the variable diameter of the valve 29 in order that the steam may be morethan balanced against itselfyotherwise it eould not move-the valve 29 contrary to the tension of the steam. By thus forcingthe valve 29 it can be made of considerable size and caused to operate with greater ease than would be the ual control of the engineers Having thusdescrlbed my inventloni'I claim case if it were actuated directly by the man- 'as new and desire to secure byLetters Patent- 1. in a balanced valve for locomotive-cylinders and'the like, the" combination of a hollow member connected with the cylinder of a loeomotivesaid hollow member being pro-' vid'ed witha-ventandwitha valve-seat, a valve disposed within said hollow member and adapt-- ed tdengage said valve-seams steam-piston dispose -within' said-ghollow member, and

means controllable at will for applying steampressure within saids'teamicylinder for. the

valve from said valve-seat.

BEST AVAlLAB'LE ("J-GP plying a steam-pressure against said steampiston;

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRED: Louis nosmson Witnesses'i W. P. Mines, L. (l. SmoN. 

